Improvement in electric lights



UNTT E STATES PATENT Enron HENRY WOODWARD, 0F. TORONTO, ONTARIO,ASSIGNOR, BY MEsNE AS- sIcNMENTs, TO. RUPERT. MEARSE wELLs', THOMASRICHARD FULLER, AND ERNEST HEIMROD, OF sAMEPLAcE, AND CHARLES H. WOODWARD,

OF LINDSAY, CANADA.

IMPROVEMENT IN ELECTRlC LlGHTS.

Specification forming part of Letters Patent No. 18 1,613, dated August29, 1876; application filed January 4, 1875.

To all whom it may concern Be it known that I, HENRY WOODWARD, of thecity of Toronto, county of York, in the Province of Ontario, Uanada,have invented new and useful improvements in the art or process ofobtaining artificial light by means of electricity; and I do herebydeclare that the following, taken in connection with the drawings whichaccompany and form part of this specification is a description of myinvention sufficient to enable those skilled in the art to practice it.

In the first place, I use a gas-engine or other suitable motive power,for the purpose of rotating a magneto-electric machine, and at such avelocity as shall create electricity sufficient to heat certain piecesof carbon hereinafter described. The magneto-electric machine should beof sufficient power for the purpose of heating the carbon to a state ofincandescence. A piece ofcarbon of suita ble size is scraped and shapeduntil fitted for the purpose; one pole is then attached to the top ofthe carbon, and the other to the bottom thereof, by suitable electrodes.It is then inclosed in a globe or other vessel, either of glass or othersuitable material. The air is then exhausted from the said globe orvessel after it has been hermetically sealed at the ends, and the globeis then filled with a rarefied gas that will not unite chemically withthe carbon when hot. Electricity is now supplied, and in sufficientquantity to heat the carbon within the vessel to a state ofincandescence. The rarefied gas previously introduced now becomesluminous, and constitutes the light herein designated as Wood wardselectric light.

This arrangement and process will give a light of any requiredintensity, and there is, practically, no limit to the number of lightsthat may be obtained from one magneto-electric machine.

' In the accompanying drawings, the same letters of reference indicatethe same parts in all the views, .and also in this specification.

Figure 1 is an elevation or front View of a piece of carbon, and ismarked B. It is supposed to be scraped and shaped until suitable for therequired purpose.

Fig. 2 is also an elevation or front View of a piece of carbon with theelectrodes E E attached thereto, leading to and from the positive andnegative poles of the battery,'one being attached at the top and theother at the bottom of the carbon.

Fig. 3 is a sectional elevation, showing a globe marked A, but which maybe a vessel of any other suitable form. The prepared carbon B is alsoshown therein, with the aforesaid electrodes E E attached thereto;showing, also, a tube, 0, with an air-tight stopcock, to be used inexhausting the air from the globe A, and for the injection of rarefiedgas into the same; showing, also, the hermetical sealing of said vesselat the ends G G of the tubes, and showing, also, the stand D.

Fig. 4. is a sectional elevation, showing the adaptation of another formof vessel, A. This drawing is ona larger scale, in order to show themanner of closing the ends of the vessel, which is done by brasssockets, that at the top being marked K, and that at the bottom beingmarked L; showing, also, a carbon, B, difi'erent in form from that inthe other vessel, and having the two electrodes E E running to and fromthe poles N and M.

Fig. 5 is an. elevation, showing one mode of connecting the variouslights with the machine by means of two trunk-wires or electrodes, H. H,running from the positive and negative poles M and N of the machine,with branches b, &c., therefrom, to each light.

Fig. 6 is also an elevation, showing another method of connecting thelights with the machine, each light having a distinct wire, b,

running to each pole M N of the machine '01 state of ineandeseence, inconnection with the battery. r described arrangement and"mode of connec-Having thus described my invention, I tion of the electrodes E E withthe carbon, claim-- all as shown and set forth.

A carbon, B, in combination with a lamp HENRY WOODWARD. or othersuitable vessel, A, filled with rare- Witnesses: fied gas, possessingthe propertyof not chem- WILLIAM FITCH, ically combining with the carbonwhen in a GEO. T. SMALLWOOD.

